Hair rooting chain-stitch sewing machine



Nov. 5, 1963 H. KlRscHENMANN 3,109,396

HAIR RooTING CHAIN-STITCH SEWING MACHINE Filed April 5, 1962 7 Sheets-Sheet l f n Z50 kann l 240 224 226 *1 256 I I f b -13 256 l l N INVENTOR. V /A/PazaL/r/@Jcf/f/VMANN L: Y z:- wwf w l 1 1 i ,4free/V575 Nov. 5, 1963 H. L.. KlRscHENMANN 3,109,396

HAIR RooIING cHAIN-sTIIcH SEWING MACHINE 7 Sheets-Sheet 2 Filed April 5. 1962 I NVEN TOR. #fl/PozaLK//Psnvf/wmm/ Nov. 5, 1963 H. L. KIRSCHENMANN 31109395 HAIR RooTING CHAIN-STITCH SEWING MACHINE 7 Sheets-Sheet 3 Filed April 5. 1962 Nov. 5, 1963 H. KlRscHENMANN HAIR ROOTING CHAIN-STITCH SEWING MACHINE Filed April 5, 1962 7 Sheets-Sheet 4 Y pube/fw fromme-Ks Nov. 5, 1963 H. L. KIRSCHENMANN HAIR ROOTING CHAIN-STITCH SEWING MACHINE Filed April 5, 1962 '7 Sheets-Sheet 5 1N VEN TOR. /m/Pmaar/scwf/wmmv ATTORNEYS Nov. 5, 1963 H. L.. KlRscHENMANN HAIR RooTING CHAIN-STITCH SEWING MACHINE 7 Sheets-Sheet 61 Filed April 5, 1962 N mm ,w mw. @mi

Nov. 5, 1963 H. KlRscHENMANN 3,109,396

HAIR RooTING CHAIN-STITCH SEWING MACHINE Filed April 5, 1962 7 Sheets-Sheet 7' INVENTOR am @Mw im United States Patent O 3,109,396 HAIR RGOTING CHAIN -STITCI-I SEWING MACHINE Harold L. Kirsche'nmann, Brooklyn, N.Y., assigner to A & B Wig Co., Inc., New York, sN.Y., a corporation lof New York Filed Apr. 5, 1962, Ser. No. 185,332 19 Claims. (Cl. 112-79.5)

This invention relates to a chain-stitch machine and more particularly to improvements in a chain-stitch machine for rooting hair in dolls scalps or heads.

The prime object of my invention is the provision of a machine for chain-stitch rooting hair-simulating threads or yarns in plastic dolls scalps, characterized primarily by the following machine improvements:

(l) The provision of a novel mechanism for forming the chain-stitch loop; and

(2) The provision of a chain-stitch machine having its driven and driving machine parts reorganized to produce a more efficient structure.

In modern chain-stitch machines employed for rooting hair-simulating threads or yarns in dolls heads, the mechanism for forming the chain-stitch loop comprises, in combination with a reciprocating needle bar (which carries a hooked needle), a cast-off bar in which the needle bar is reciprocable, to which cast-off bar is imparted a compound motion consisting of a rocking movement and a reciprocating movement, the rocking movement functioning for feeding the doll head (by way of the hooked needle which partakes of the rocking movement), and the reciprocating movement functioning to move needle bracing cast-off pins (attached to the working end of the cast-off bar) for intercepting and then casting off chain-stitch loops formed in 'the operation of this mechanism.

In the machine of my present invention, the chainstitch loop forming mechanism is simplied in structure and operation. I have found that in the operation of doll head-rooting machines, the chain-stitch loop may be formed without imparting a reciprocating movement to a cast-off bar and without the use of the customary cast-olf pins. In the machine of the present invention, the needle bar is mounted for reciprocation in a needle post provided at its working end with a needle brace, to which needle post is imparted only a simple back and forth translatory motion, preferably a rocking motion. In this mechanism, the thread loop, formed by the hooked needle and carried by it into the needle brace, is moved out of the needle .brace Vby the return stroke of the needle, and is thereupon freed in loop form to produce the chain-stitch loop. A simplified chain-stitch loop mechanism is not only thereby produced, but also a more efficient overall machine capable of a speedier and quieter operation.

The machine of the present invention comprises furthermore a reorganization of the driving and driven machine parts of such a chain-stitch machine in which (a) all of the driving machine parts are located below and all the driven machine parts are located above a base plate or base-board, (b) in which the base-board forms the top of a casing which constitutes an enclosure, and which may be an oil-iilled enclosure, for the driving machine parts, and (c) in which the operating connections between the casing enclosed driving machine parts and the casing surmounted driven machine parts are direct, short and simple, thereby resulting in a compactly organized, easily and noiselessly operated apparatus.

To the accomplishment of the foregoing objects and such other objects as may hereinafter appear my invention relates to the chain-stitch machine as defined in the appended claims considered together with the following "ice specification and the accompanying drawings, in which:

FIGURE 1 is a plan view of .the machine (with some parts broken away);

FIG. 2 is a front elevational view of the machine;

FIG. 3 is a left end view of the machine taken in cross-section in the plane of the line 3-3 of FIG. 2;

FIG. 4 is a plan view of the machine taken in crosssection in the plane of the line 4-4 of FIG.. 2;

FIG. 5 is a front elevational view of the machine taken in cross-section in the plane of the line 5 5 of FIG. 4;

FIG. 6 is an elevational View taken in cross-section in the plane of the line 6--6 of FIG. 4;

FIGS. 7 through 14 are diagrammatic views showing in sequence the positioning and the operation of the mechanism of the machine for forming the chain-stitch loop;

FIG. l5 is a top plan view of a part of the mechanism shown in FIG. 7 modified for employment with a three needle machine; and

FIG. 16 is a view of the part shown in FIG. l5 taken in cross-section in the plane of the line 16-16 of FIG. 15.

Referring now more in detail to the drawings, I shall make reference first to FIGS. 7 to 14 which show diagrammatically the positioning and operation. of the parts of the mechanism for forming the chain-stitch loop. The essential parts of this mechanism are shown in FIG. 7, the same comprising in combination with the work support 20 for holding the work 22, such as a doll head to be chain-stitched, a needle post 24 carrying a needle brace 26 at its work support end, said needle post being mounted solely for a back and forth translatory motion as indicated by the double headed arrow 28, a needle bar 30 carrying a hooked needle 32 at its work end, said needle bar being mounted for reciprocation in the: needle post as indicated by the double headed arrow 34.. The workpiece, namely the doll head 22, is held to the work support 20 by a presser foot 36. Associated with this mechanism is a thread extender 38 preferably in the form of a rotary slotted disk (the slots being indicated as 38') and a looper 42 through which the hair-simulating thread or yarn 44 is threaded and brought into position for engagement by the hook 32 of the needle 32, the thread or yarn being continuously drawn from a container (or spool) 46. The translatory motion, preferably a rocking motion, that is imparted to the needle post 24 moves the same through the sequential positions depicted in FIGS. 7 to 14 and the reciprocating motion imparted to the needle bar 30 moves the same with its needle through the sequential positions shown in these figures. The .thread extender 38 rotating in one direction engages aiid extends the thread 44 in the manner depicted sequentially in these FIGS. 7 to 14, carrying the same to a cutter 48 (FIGS. 13 and 14) where the extended thread is cut to form single hair strands. In these diagrammatic FIGURES 7 to 14, for simplicity, I have shown the mechanism employing a single needle. The number of needles may be multiplied; and in the remaining figures of the drawings, I show a machine employing three needles.

The sequence of the positioning and the operation of the parts of the chainastitch mechanism depicted in FiGS. 7 through 14, and the results in producing the chainstitched assembly, may now be described. In these figures the presence of the single headed arrows depicts that the parts are in mot-ion (in the arrow indicated direction) and their absence depicts that the parts are relatively stationary, having reached the end of their strokes (i.e. translationally or reciprocatingly, as the case may be).

3,1o9,39e l The needle post 24, to which is yimparted solely a translatory (a rocking) motion moves in one direction of its stroke, indicated by arrow 56 (FIG. 9), from the upright position of FIG. 7 to the inclined position of FIG. l0, and in the other direction of its stroke, indicated by the arrow 58 (FIG. 1l), from the inclined position of FIG. 10 back to the upright position of FIG. 12. Y

The needle bar 24, to which is imparted an independent reciprocating motion, (but which also moves translationally with the needle post) moves in one direction of its reciprocatory stroke, indicated by the arrow 60 (FIG. 1l), from the descended position of FIG. 9 to the ascended position of FIG. 12, and in the other direction of its stroke, indicated by the arrow 62 (FIG. 13), from its said ascended position back to the descended position of FIG. 9.

Considering the cycle of movement of the needle bar 24 between its FIG. 7 and its FIG. 13 positions, the thread extender 38 moves (rotates) a distance substantially equal to (slightly greater than) the length of a disc slot 3S".

The looper 42, to which is imparted a reciprocatory motion, moves in one direction of its stroke (away from needle position), indicated by the arrow 64- (FIG. 12), from the position of FIG. 11 to the position of FIG. 14, and 4in the other direction of its stroke, indicated by the arrow 66 (FIG. 10), from the position of FIG. 14 back to the position of FIG. 11.

The pressor foot 36, engaging the doll head to hold the same to the support 20, it raised or lifted, las indicated by the arrow 68 (FIG. 1l) when the parts are in the position of FIG. l1, and is then returned to engage the doll head, as indicated by the arrow 70 (FIG. l2) when the parts are in the position depicted in FIG. 12.

The needle post 24 preferably is made in the form of a tubular member and the needle bar 30 is mounted for slidable motion therein. The needle brace 26 caps the needle post and is xed. thereto. The needle brace is formed with a bore 26 flared at the lower end 262 thereof (see FIG. 7). The pressor foot 36 is open or channeled at one side as shown. The support is 'also open at one side and is substantially semi-circular in crosssection as shown. The top of the brace 26 is spacedand maintained only a fractional distance (about a quarter of an inch in a built machine) from the top of the Work support 20, the distance being sufficient only to permit resistance-free movement of the brace laterally with reference to the workpiece. The material of the doll head is resilient and tlexible, being preferably made of a vinyl plastic or resin.

The operation of this described chain-stitch loop mechanism over a cycle beginning with the position of the parts depicted in FIG. 7, will now be described, such kcycle being shown in the sequential FIGURES 7 through 14. l

The beginning end of the thread or yarn 44 coming from the supply container 46, threaded through the looper 42, and through the slot 38 of the extender (slotted disc) 33, has been engaged and looped by the-needle hook 32', with the needle bar descending. Upon further descent of the needle bar to the posit-ion shown in FIG. 8, the needle carries the now embryo thread loop, now designated as L, past the presser foot 36, through a perforation p in the doll head (the perforation having been previously made by the needle in its upward stroke) and into the bore 26' of the needle brace 26, the slotted disk 38 meanwhile advancing to draw out the supply endV of the thread 44. The needle bar 30 continues yits descent to the end of its stroke shown in FIG. 9; and the needle post 20 is meanwhile being rocked from its erect FIG. 8 position toward its inclined position. The loop now takes the extended and bent form shown in FIG. 9. The extending of the loop is permitted because the free end of the thread is not under tension; and the extended and now full loop is held by the resiliency of the wall of the CTl perforation p in the dolls head. Also the bottom or bight of the loop expands into the flared end 262 of the bore of the brace. The slotted disc 3S continues its advance further drawing out the thread 44 as shown.

As the parts move from the FIG. 9 to the FIG. 10

position, the needle post has moved to the nal inclined position; and with the needle bar 30 now ascending, the needle 32 penetrates the doll head 22 forming therein a new perforation p. The returning stroke of the needle from the FIG. 9 to the FIG. l0 position frictionally moves `and carries the thread loop L with its expanded bight out of the bore of the needle brace; and the loop, embracing the needle, is freed from the brace, thereupon moving into the loop position, generally parallel to the inside surface of the doll head, depicted in FIG. 10. The bore-flare 262 in addition to performing the function of permitting the loop bight to expand (the resilience of the thread material, particularly when made of a plast-ic resin such as Saran, contributing to this), inhibits shearing of the thread loop `at its bight during the return movement of the needle in the brace bore. The slotted disc 38 continues its advance further drawing out the supply thread as shown in FIG. l0.

With the parts incrementally moving from the FIG. 10 to the FIG. 11 position, the presser foot 36 is lifted from the work piece, and the return translational stroke of the needle post 24 with the needle bar and needle carried thereby is begun. The parts then move from the FIG. 11 to the FIG. l2 position, completing the return stroke of the needle post to its erect position. This movement, by the engagement of the needle with the work piece, moves or feeds the doll head in the direction indicated by the arrow 72 (FIG. 11) from its FIG. l1 to its FIG. 12 position. The presser foot 36 is thereupon returned to engage the vdoll head as shown in FIG. 12. The needle bar 30 has meanwhile ascended to move the needle 32 to the end of its ascending stroke as shown in FIG. 12. Tne extended thread loop L, the branches of which are resiliently held by the wall of perforation p, retains its loop form as shown in FIGS. 10 through 12. During the movement from the FIG. l0 position to the FIG. l2 position, the slotted disc 38 continues its advance further drawing out or extending the supply end of the thread 44.

When the described parts reach the FIG. l2 position a second loop is in the making. The looper 42 after reaching the inward end of its reciprocating stroke (FIG. 1l) is in a position in front of the needlejand on its return stroke, moving in the direction of the arrow 64 (FIG. 12), the supply end of the thread 44'V as depicted in FIG. l2 is engaged by the needle hook 32'. With the parts then moving to the FIG. 13 position, a new embryo loop L is formed, and is drawn to the doll head perforation p'. The disc 33 has now advanced to the position where the thread 44 is about to be severed by the fixed cutter blade 48. In the next incremental movement of the parts to the FIG. 14 position, the new loop L is drawn into the brace bore, and the thread 44 is severed by the cutter, the new loop L being moved through the rst loop to produce the interlocked or chain-stitch as depicted in FIG. 14. Both branches of the loop L are now free, thus forming the rst hair strands. The first loop L is thus now chain-stitched by the new loop L.

The repeating of this described operating cycle, in acting in succession on the supply thread 44 results in the formation of succeeding loops similar to the completed loop L, and their chain interlocking, producing a series of chain-looped hair strands.

Referring now to FIGS. l to 6r of the drawings, in which the parts that are the same as the parts diagrammatically shown in FIGS. 7 to 14 are designated by the same reference characters, I show the organized chain-stitch machine, the same comprising a casing 74` having a closure or top 76, driven machine parts generally designated as 78 extending upwardly from and also supported on the casing top 76, and driving machine parts generally designated as Sil located within the casing 74 below the casing top, the driving machine parts 36 being connected to the driven machine parts 78 by means of operating elements which extend upwardly through and are supported by the casing top. This organized machine is mounted on a supporting metal framework 82 which is surmounted by a frame S4 from which are hung one or more thread containers 46 (three such containers being indicated in the drawings).

The Needle Post and Needle Bar Operation The needle bar 24 carrying the needle post 30 extends upwardly through the casing top 76 as best shown in FIGS. 3 and 5 of the drawings. The needle bar 30 is mounted in the needle post 24 for sliding reciprocating movement guided therein at the bottom by a sleeve 86 and at the top by the needle brace 26 and needles 32. The needle bar is reciprocated by means of a crank pin 88 deriving power from a main shaft 90, the crank pin being connected to the needle bar by means of a link 92. The main shaft 9i) is mounted by means of the ball bearings 93 and 94 (see FIG. 5) on the integrally cast bearings $6 and 98 respectively. The needle post 24, to which, as stated, is imparted only a translational (rocking) movement, is rocked by means of an arm 100 secured to a block 102 mounted for rocking motion about a pivot 164 on the integrally cast bearing 106, the needle post 24 being fixed to the block 102 (see FIGS. 3 and 5). The said arm 160 is provided at its free end with a cam follower 108 which coacts with a cam 110 fixed to the main shaft 90. The said cam 11i) is used to mount the crank pin 88 (see FIG. 5). The high and low points of the cam 11i) are designated respectively as h and l (see FIG. 3).

For adjusting the stitch length I provide an adjustable cam 112 manually movable exteriorly of the casing 74 at 114 (FIG. 5), a nut being employed to fix the cam after adjustment. The said cam coacts with a plate 116 forming part of an arm 11S integral with the lock 162, a tension spring 120 being employed to connect the free end of the arm 118 to an integrally cast anchoring stud 122. By adjusting the stitch control cam 112, the position of the arm 161) and its cam follower 108 is adjusted with reference to the periphery of the cam 110, and therei by the stitch length may be varied.

The tubular needle post 24 is provided with an opening (window) 124 in its wall near its needle brace end (see FIG. 3). The needles 32, formed with a uniform diameter shank, are removably attachable to the needle bar 39 through the bores of the needle brace 26; and set screws 126, one for each needle, are provided in the needle bar for securing the needles thereto (see FIG. 3). The set screws 126 are accessible through the opening or window 124. By means of this structure needles may be readily mounted in the needle bar and replaced when broken. The window 124 also serves the purpose of permitting any vinyl (doll head) chips which may be drawn into the needle brace to be agitatingly expelled from the interior of the needle rod.

By means of this construction rotation of the main shaft 99, rotating crank pin 88 and cam 116 in the arrowed direction indicated in FIG. 3, imparts synchronous reciprocation to the needle rod 30 and a rocking movement to the needle post 24.

The Thread Extender Operation The thread extender 3S which is in the form of a slotted disc best shown in FIG. 1 of the drawings, having the slots 38', is fixed to a bushing 123 (see FIG. 6) secured in turn to a tubular shaft 130 rotatable in ball bearings 132 and 134 mounted at the opposite ends of a cast standard 136 secured as by means of the screws 13S to the casing top 76. Rotation is imparted to the tubular shaft 131) by means of the gearing train generally designated as 1413 deriving power from the main shaft 90. This gearing train (see FIGS. 4, 5 and 6) comprises a bevelled pinion 142 fixed to the main shaft meshing with a bevelled gear 144 fixed to a shaft 146 mounted in the integral bearing 148, a pinion 156 splined at 152 to the shaft 146 meshing with a pinion 154 joined to a pinion 156, the pinion 156 in turn meshing with a gearing 158, the latter in turn being fixed to the tubular shaft 130. The joined pinions 154 and 156 rotate in a bearing 160 mounted in an arm 162 anchored for adjustment about a fixed tube 164, the said arm 162 being provided with a slot and screw adjusting means 166, the screw of which is threadedly anchored to the integral bearing 148 (see FIG. 5

The length of the hair produced by the machine may be adjusted; and as one of the means for this purpose the gear ratio of the described gearing system is adjusted. This is done by lifting the gear from its splined mounting and replacing the same with a gear of a different size, the arm 162 being in turn adjusted by the means 166 to permit such replacement. It will be understood that in making a change in the gearing ratio, the slotted disc 38 must also be replaced by a disc having a different number of slots (related to the gear ratio change) and that the position of the cutter 148 must also be adjusted.

The Looper Operation The looper 42 (which is provided with three boressee FIG. l-to accommodate three threads) is reciprocated by being connected to an oscillatable rod 168 located within and extending through the tubular shaft 13), which rod is oscillatable within the fixed tubular element 164, being spaced therefrom by upper and lower spacing elements 179 and 172 (see FIG. 6). The fixed tubular element 164 is secured at its bottom to the integral bearing 174 and at its top to a fixed arm 176 surmounting the bushing 12S, which arm extends radially of the machine (see FIG. 1). The operating rod 168 is oscillated by being connected to the main shaft 90 by means of an arm 17S pivotally connected at one end to a link 180 in turn afiixed to the rod 168 and having at its other end an eccentric strap 182 coacting with an eccentric 184 fixed to the main shaft 90. At its upper end the operating rod 168 is connected to the looper 42 by means of a rod 186 pivoted at is inner end to a link 188 in turn fixed to the rod 168 and pivoted at its outer end to the looper 42, which latter has an arm 42 pivoted to the end of the fixed arm 176.

Upon the rotation of the main shaft 90 the eccentric arm 17 8 is reciprocated, in turn imparting an oscillation to the operating rod 16S, which in turn imparts a reciprocating motion to the looper 42.

The Presser Foot Operation The presser foot 36 is reciprocated by an operating rod 19t) extending through the casing top 76 and housed within a standard 192 secured, as shown particularly in FIG. 5, to the casing top. To the top of the standard 192 is affixed a guide block 194. The presser foot 36 (which is provided with three needle channels-see FIGS. 1 and S-for accommodating the three needles) is secured to the enlarged upper end 196 of the rod 190. The lower end of the operating rod (see FIGS. 5 and 6) is provided with a nut 198 which engages a block 200, a rubber pad 262 being interposed therebetween, the said block being hinged at 204 to the casing-integral trunnion piece 206 and being also hinged at 20S to a trunnion 210 forming part of an eccentric strap 212 operated by an eccentric 214 fixed to the main shaft 90.

To permit manual lifting of the presser foot 36 (in addition to its automatic operation heretofore described) the rod 190 is independently movable (being separated for this purpose from the block-266 by the rubber pad 202) against the load of a spring 216, manual lifting of the rod being made possible by the provision of a lever 218 fulcrumed at 220 to the housing pedestal 136, the free end of the lever being movable to engage the presser foot 36, and the other end of the lever being connected to a link 222, which in turn is connected at its bottom to a knee lever 224 by way of a hinge member 226 and a connecting rod 228.

In the automatic operation of the machine, rotation of the eccentric 214, assisted by the return action of the spring 216, will lift the presser foot from the work and return the same in the manner heretofore described (in connection with FIGS. 7 to 14). Manual lifting of the presser foot is effected by pressure exerted on the knee lever 224, which pressure is transmitted to the lever 218 to lift the presser foot.

The Cutter Operation The cutter 48 rests on the disc 38, and cutting of the threads is effected by the shearing action between the cutter blade and the upper edge of the wall of a disc slot (at an inwardly channeled portion 382 of the slot, see FIG. 1). Y The cutter 48 is mounted on a cutter arm 230 adjustably fixed as by means of the set screw 232 to the fixed tubular member 164 (see FIGS. l and 6). The cutter 48 is mounted on the cutter arm 230 so as to be resiliently engageable with the top face of the disc 38; and for this purpose it is spring loaded by means of the compression springs 234.

M achne Operation The machine is operated from an electric clutch motor 236 suspended from the supporting framework 82., the pulley 238 of said motor being connected by means of a belt or chain 240 to a pulley 242 affixed to the main shaft extension 244 protruding from the casing 74. The pulleys and belt may be housed by a guard 246 (see FIGS. 1 and 2); and to the shaft may be attached a hand wheel 248 for manually turning of the shaft.

For rooting hair in a dolls head, the presser foot 36 is manually lifted by pressure exerted on the knee lever 224, and a head 22 is placed on the top of the work support 20. The presser foot is then permitted to descend to engage the doll head between it and the work support. The thread or threads 44 taken from the supply containers 46 are first threaded through a guide 250 (FIGS. 1 and 2) and then through a second guide 252 located adjacent the work, after which the threads are threaded through the bores of the looper 42, all as illustrated in FIGS. 1 and 2 on the drawings. The guide 252 is supported by an arm 254 fixed to the stationary arm 176 (see FIG. l).

Upon motor operation the dri-ving machine parts 80 all located within the casing 74, and which casing may be lled with oil thus constantly lubricating all of the driving machine parts (an oil seal 256 being provided for this purpose at the casing shaft opening-see FIG. 5), operate, by direct tand short connections, all of the driven machine parts 78 compactly located above the top 76 of the casing. In a broader sense the casing top 76 comprises a base-board, the driving machine parts being all located below and the driven machine parts being all located asbove the base-board, the `driven machine parts being all supported in and from the base-board. The needle post, the needle bar, the thread extender (slotted disc), the looper and the presser 'foot are operated in synchronism by the described mechanism in the manner explained in connection with the diagrammatic views of FIGS. 7 to 14. The operation of a three needle machine shown in FIGS. 1 to 6 corresponds to the operation of the single needle machine described in connection with FIGS. 7 to 14. In a three needle machine the needle brace 26 is made to accommodate three needles, and the presser foot and looper are modified accordingly. In FIGS. and 16 of the drawings I show the modification of the needle brace, designated there as 2601, the same being provided with the threerorices 269 preferably flared at the bottom as shown. Also preferably the top 262 of the needle brace is reduced in width, this for the purpose of minimizing yfriction when the needle Ypost is moved relatively to the work.

VThe use, operation of the chain-stitch machine and the many advantages thereof will be apparent from the above detailed description. It will also be apparent that many chan-ges may Ibe made in the structure of the machine without departing from the spirit of the invention defined in the following claims.

I claim:

l. In a chain-stitch machine, in combination with a work support for holding the work to be chain-stitched, mechanism for forming the chain-stitch comprising a needle post xedly carrying a needle brace at its work support end, said needle post being mounted solely for a back and forth translatory motion, means for imparting the translatory motion to said needle post to feed the Iwork, a needle bar carrying a hooked needle at its work end, said needle bar being mounted for reciprocation in the needle post, rmeans for reciprocating the needle ba-r in said needle post over the length of a stroke to move the hook of the needle between a position above said Vwork for engaging and forming a loop in a thread and a position within said needle brace to carry the thread loop into said needle brace, the return stroke of the needle being effective to move and free the thread loop from said needle brace and to thereby form a 'chain-stitch loop.

2. The chain-stitch mechanism in the chain-stitch machine of claim 1, in which the needle brace comprises a member formed with a bore having a ilared inner end, the wall of the bore `guiding the needle and accommodating the same and the thread loop and the wall of the flared end vof the bore functioning to permit expansion of the loop `when the needle hook reaches the inner end of its stroke.

3. The chain-stitch mechanism in the chain-stitch marchine of claim 1, in which the top of the needle brace is spaced only a fractional distance from the top of the work support, suflicient only to permit resistance-free feeding of the work.

4. In a chain-stitch machine, in combination with a work support for holding the work to be chain-stitched, mechanism for forming the chain-stitch comprising a needle post fixedly carrying a needle brace at its work support end, said needle post being mounted solely for a rocking motion, means for imparting the rocking motion to said needle post to feed the work, a needle bar carrying a hooked needle at its work end, said needle bar being mounted for reciprocation in the needle post, means for reciprocating the needle bar in said needle post over the length of a stroke to move the hook of the needle between a position above said work for engaging and forming a loop in a thread and a posit-ion within said needle brace to carry the thread loop into said needle brace, the return stroke of the needle being effective to move and free the thread loop from said needle brace and to thereby form a chain-stitch loop.

5. The chain-stitch mechanism inthe chain-stitch machine yof claim 4, in which the means for imparting the rocking motion to the needle post comprises a cam carried by a main shaft, and au arm att-ached to said needle post carrying a cam follower engageable with said cam, and in 'which the means for reciprocating the needle bar comprises a crank carried by said main shaft and a link member connecting the needle bar with said crank.

6. In the chain-stitch machine of claim 5, means for predetermining the degree of movement of the rocking motion comprising a manually adjustable cam member operative on an arm connected to said needle post.

7. A `chain-stitch machine for rooting hair-sirnulatin-g threads in dolls scalps comprising a casing having a top, a work support extending upwardly from the casing top, driven machine parts supported in the casing comprising a movable needle post carrying a movable needle bar extending upwardly through the casing top, standard mea-ns extending upwardly from the casing top mounting a rotary thread extender, a movable looper and a movable presser foot, the extender, the looper and the presser foot each having an operating element extending upwardly through the casing `top and through said standard means; and dniving machine parts all located below the casing top connected to the operating elements of the extender, looper and presser foot and connected to the needle post and the needle bar for driving the said driven parts in synchronism.

8. The chain-stitch machine of claim 7, in which the casing forms an enclosure for the said driving machine parts.

9. The chain-stitch machine of claim 7, in which the operating element for the thread extender is a rotary member, the operating element for the iooper is an oscillatable member and the operating element for the presser foot is a vertically reciprocable member.

10. The chain-stitch machine of claim 9, in which the driving machine parts for the operating elements of the thread extender, the looper and the presser foot, all lcated within the casing, comprise a main shaft, gearing connecting the main shaft to the rotary member of the thread extender, an eccentric and linkage connecting the main shaft to the oscillatable member of the looper, and an eccentric and a link connecting the main shaft to the vertically reciprocable member of the presser foot.

1l. The chain-stitch machine of claim 7, in which the movable needle post is mounted in the casing for a rocking movement and in which the needle bar is mounted for reciprocation in the needle post.

12. The chain-stitch machine of claim 11, in which the driving machine parts for the needle post and needle bar, all located within the casings, comprise a main shaft, a cam and cam follower arm connecting the main shaft to the needle post, and a crank and link connecting the main shaft to the needle bar.

13. The chain-stitch machine of claim 7, in which the operating element for the thread extender is a rotary tube, the operating element for the looper is an oscillatable rod located within said rotary tube and the operating element for the presser foot is a vertically reciprocable member.

14. A chain-stitch machine for rooting hair-simulating threads in dolls scalps comprising a base-board, a work support extending upwardly from the base-board, driven machine parts supported below the base-board comprising a movable needle post carrying a movable needle bar extending upwardly through the base-board, standard means extending upwardly from the base-board mounting a rotary thread extender, a movable looper and a movable presser foot, the extender, the looper and the presser foot each having an operating element extending upwardly through the base-board and through said standard means; and driving machine parts all located below the baseboard connected to the operating elements of the extender, looper and presser foot and connected to the needle post and the needle bar for driving the said driven parts in synchronism.

15. The chain-stitch machine of claim 14, in which the operating element for the thread extender is a rotary member, the operating element for the looper is an oscillatable member, and the operating element for the presser foot is a vertically reciprocable member, and in which the needle post is mounted below the baseeboard for a rocking motion and the needle bar is mounted in the needle post for reciprocatory motion.

16. The chain-stitch machine of claim l5, in which the driving machine parts comprise a main shaft, gearing connecting the main shaft to the rotary member, an eccentric and linkage connecting the main shaft to the oscillatabie member, an eccentric and a link connecting the main shaft to the vertically reciprocable member, a cam and cam follower arm connecting the main shaft to the needle post, and a crank and link connecting the main shaft to the needle bar.

17. A chain-stitch machine for rooting hair-simulating threads in dolls scalps comprising a casing having a top, a work support extending upwardly from the casing top, driven machine parts supported in the casing comprising a movable needle post carrying a movable needle bar extending upwardly through the casing top, standard means extending upwardly from the casing top mounting a rotary thread extender and a movable iooper, the extender and the looper each having an operating element extending upwardly through the casing top and through said standard means; and driving machine parts all located below the casing top connected to the operating elements of the extender and looper and connected to the needle post and the needle bar for driving the said driven parts in synchronism.

18. The chain-stitch machine of claim 17, in which the driving machine parts for the operating elements of the thread extender and the looper, all located within the casing, comprise a main shaft, gearine connecting the main shaft to the rotary member of the thread extender, and an e centric and linkage connecting the main shaft to thc oscillatable member of the looper.

19. A chain-stitch machine for rooting hair-simulating threads in dolls scalps comprising a base-board, a work support extending upwardly from the base-board, driven machine parts supported below the base-board comprising a movable needle post carrying a movable needle bar extending upwardly through the baseboard, standard means extending upwardly from the base-board mounting a rotary thread extender and a movable looper, the extender and the looper each having an operating element extending upwardly through the base-board and through said standard means; and driving machine parts all located below the base-board connected to the operatintg elements of the extender and looper and connected to the needle post and the needle bar for driving the said driven parts in synchronism.

References Cited in the tile of this patent UNITED STATES PATENTS 269,770 Wood Dec. 26, 1882 397,082 Humphrey Ilan. 29, 1889 983,343 Bayer Feb. 7, 1911 1,793,866 Myers Feb. 24, 1931 2,249,615 Lutz July 15, 1941 2,812,734 Richards Nov. 12, 1957 2,977,906 Follender Apr. 4, 1961 

1. IN A CHAIN-STITCH MACHINE, IN COMBINATION WITH A WORK SUPPORT FOR HOLDING THE WORK TO BE CHAIN-STICHED, MECHANISM FOR FORMING THE CHAIN-STITCH COMPRISING A NEEDLE POST FIXEDLY CARRYING A NEEDLE BRACE AT ITS WORK SUPPORT END, SAID NEEDLE POST BEING MOUNTED SOLELY FOR A BACK AND FORTH TRANSLATORY MOTION, MEANS FOR IMPARTING THE TRANSLATORY MOTION TO SAID NEEDLE POST TO FEED THE WORK, A NEEDLE BAR CARRYING A HOOKED NEEDLE AT ITS WORK END, SAID NEEDLE BAR BEING MOUNTED FOR RECIPROCATION IN THE NEEDLE POST, MEANS FOR RECIPROCATING THE NEEDLE BAR IN SAID NEEDLE POST OVER THE LENGTH OF A STROKE TO MOVE THE HOOK OF THE NEEDLE BETWEEN A POSITION ABOVE SAID WORK FOR ENGAGING AND FORMING A LOOP IN A THREAD AND A POSITION WITHIN SAID NEEDLE BRACE TO CARRY THE THREAD LOOP INTO SAID NEEDLE BRACE, THE RETURN STROKE OF THE NEEDLE BEING EFFECTIVE TO MOVE AND FREE THE THREAD LOOP FROM SAID NEEDLE BRACE AND TO THEREBY FORM A CHAIN-STITCH LOOP. 